The parametrix of regular hypoelliptic boundary value problems
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 26 (1972) no. 1, pp. 247-268. 
@article{ASNSP_1972_3_26_1_247_0,
     author = {Barros-Neto, J.},
     title = {The parametrix of regular hypoelliptic boundary value problems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {247--268},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 26},
     number = {1},
     year = {1972},
     mrnumber = {477425},
     zbl = {0235.35026},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1972_3_26_1_247_0/}
}
TY  - JOUR
AU  - Barros-Neto, J.
TI  - The parametrix of regular hypoelliptic boundary value problems
JO  - Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche
PY  - 1972
SP  - 247
EP  - 268
VL  - 26
IS  - 1
PB  - Scuola normale superiore
UR  - http://archive.numdam.org/item/ASNSP_1972_3_26_1_247_0/
LA  - en
ID  - ASNSP_1972_3_26_1_247_0
ER  - 
%0 Journal Article
%A Barros-Neto, J.
%T The parametrix of regular hypoelliptic boundary value problems
%J Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche
%D 1972
%P 247-268
%V 26
%N 1
%I Scuola normale superiore
%U http://archive.numdam.org/item/ASNSP_1972_3_26_1_247_0/
%G en
%F ASNSP_1972_3_26_1_247_0
Barros-Neto, J. The parametrix of regular hypoelliptic boundary value problems. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 26 (1972) no. 1, pp. 247-268. http://archive.numdam.org/item/ASNSP_1972_3_26_1_247_0/

[1] J. Barros-Neto, Kernels associated to generat elliptic problems, Jour. of Fund. Anal., vol. 3, no. 2, (1969), 173-192. | MR | Zbl

[2] J. Barros-Neto, On the existence of fundamental solutions of boundary problems, Proc. of the Amer. Math. Soc., vol. 24, no. 1, (1970), 75-78. | MR | Zbl

[3] J. Barros-Neto, On Poisson's kernels, Anais Acad. Brasil. Ciencias, | Zbl

[4] L. Hörmander, Linear partial differential operators, Springer Verlag, Berlin, 1963. | MR | Zbl

[5] L. Hörmander, On the regularity of the solutions of boundary problems, Acta. Math. 99 (1958), 225-264. | MR | Zbl

[6] F. Treves, Linear partial differential equations with constant coefficients, Gordon Breach, N. Y. 1966. | MR | Zbl